test(profiling): fix a flaky test checking task name (#3487) (#3514)

The task name is not always the main thread, as another coroutine might run and
might have been started by another test.

(cherry picked from commit f50a3b6)

Co-authored-by: Julien Danjou <[email protected]>

Author: mergify[bot]

tests/profiling/collector/test_stack.py

@@ -73,7 +73,7 @@ def test_collect_once():
         if e.thread_name == "MainThread":
             if TESTING_GEVENT:
                 assert e.task_id > 0
-                assert e.task_name == e.thread_name
+                assert e.task_name is not None
             else:
                 assert e.task_id is None
                 assert e.task_name is None